Ormrod



UNITED sTATEs PATENT oEEioE.

ORMROD C. EVANS, OF NEXV YORK, N. Y.

STEAM-ENGINE.

Specification of Letters Patent No. 27,786, dated April 10, 1860.

To all whom it may concern.'

Be it known that I, ORMROD C. EVANS, of New York city, county and State,have invented certain novel and useful Improvements in the Mode ofOperating Shafting for Steam-Engines; and I hereby declare the followingto be a full, clear, and exact description thereof, reference being hadto the accompanying drawings and to the letters of reference markedthereon, which letters constitute and form a part of the specification.

To enable the public to fully understand the nature of my aforesaidinvention and those skilled in the mechanic arts to construct it andoperate the same I will describe it as follows.

The ligure is a perspective drawing of a stationary steam engine havingmy improvements attached as shown at letters (A, A, A2, A3,) which are aseries of rule joints so arranged that they form the connection betweenthe piston rod by means of the bridles (F, F,) when operated or movedforward by the piston in cylinder (J.)

(1),) is the cross head which supports the piston rod (N, N, N,) andtravels back and forth with the same. This cross head is also providedwith movable arms which are supplied with vertical pins (e, e,) at theouter ends thereof these pins move backward and forward in thehorizontal curved slits in plates (M, M,) which also serve asslide-plates upon which the crosshead (D,) travels.

The Oflice of the springs (S, S,) is to force the arms (e, e,) towardthe outer curve of the slits next to the inner edges of the slide plates(M, M,) by which means the concussion is entirely overcome if thesprings are sufficiently strong.

((1,) is an adjustable compound lever employed to operate the valve insteam chest (K,) by means of a horizontal plate provided with a catch orlip at each end thereof, this plate is fastened to the cross head (D,)so that the catches or lips strike the lower end of the lever (C,) asthe piston is moved in either direction.

The nature of my invention consists in converting reciprocating intorotary motion and applying the same to stationary steam engines by meansof a cam operated by a jointed piston rod which rod presses the cam uponthe outer face of the driving wheel (G,) in its (the piston rods)backward motion, while the cam (B,) is detached from the face of wheel(Gr,) during the forward movement of the piston rod and cam.

The superiority of my mode of operating a shaft of a stationary steamengine is that it imparts the greatest amount of available power whenthe cam is in contact with the face or outer periphery of the drivingwheel at the same time the reaction of the piston raises the cam so thatthe wheel and shaft continue their forward rotatory course withoutobstruction.

The novelty consists in constructing a iexible or jointed piston rod (A,A,) at the outer end of which is attached an eccentric cam (13,) whichis so held in a working position upon the smooth face of a driving wheel(G,) by means of movable bridles (F, F,) attached to the main shaft (I,)and cam (13,) that when the power is applied and the piston is movedsuddenly forward the cam takes hold on the face of the driving wheel(G,) drawing it forward also. And when the piston is moved back the camis released from contact with the driving wheel allowing it, the wheel,to continue its motion without hindrance from the cam connection orpower setting it in m0- tion.

Attached to the main shaft (as in ordinary engines) is a balance wheelwhich in weight is intended to be proportioned to the amount of poweremployed and the work to be done, the effect of which is, when set linmotion by my attachment that the balance wheel and shaft accumulatemotion more readily than from the ordinary engine crank attachment, andif the jointed portion of the piston rod is constructed of sufficientlength to admit the cam to travel one-fifth, one-fourth, or one-third,the periphery of the driving Wheel (when a suiieient amount (S, S,) andCompound lever (C) in combiof power is applied) a free and regularmonation, constructed and arranged substan- 10 tion of the main shaft isobtained. tially as described and for the purpose set Therefore what Iclaim as novel and useforth and shown in the drawings. 5 ful, and desireto secure by Letters Patent ORMROD C. EVANS.

of the United States is- Witnesses:

The 0am (B,) the rule joints (A, A', A2, JAMES P. MGLEAN, A3,) bridles(F, F,) arms (e, 6,) springs Gr. S. GILLCHREST.

